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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Do you need to just make an image that looks like a map, or do you need to make an actual map (i.e. derived from spatial data)? I think leaflet is still the go to OSS webmap library, and will do hexbins. It has a react version.
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Hence, a higher number means a more popular project.